|
1
|
Shimura K, Lee T, Ito T, Kim D. Selective hydrothermal synthesis of water-soluble CdTe and CdTe/CdS colloidal quantum dots by controlling the Te/Cd molar ratio of the precursor solution. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kunio Shimura
- Department of Applied Physics, Osaka City University, Osaka 558-8585, Japan
| | - TaeGi Lee
- Department of Applied Physics, Osaka City University, Osaka 558-8585, Japan
| | - Tatsuya Ito
- Department of Applied Physics, Osaka City University, Osaka 558-8585, Japan
| | - DaeGwi Kim
- Department of Applied Physics, Osaka City University, Osaka 558-8585, Japan
| |
Collapse
|
|
2
|
Lee T, Enomoto K, Ohshiro K, Inoue D, Kikitsu T, Hyeon-Deuk K, Pu YJ, Kim D. Controlling the dimension of the quantum resonance in CdTe quantum dot superlattices fabricated via layer-by-layer assembly. Nat Commun 2020; 11:5471. [PMID: 33122641 PMCID: PMC7596095 DOI: 10.1038/s41467-020-19337-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 10/07/2020] [Indexed: 12/21/2022] Open
Abstract
In quantum dot superlattices, wherein quantum dots are periodically arranged, electronic states between adjacent quantum dots are coupled by quantum resonance, which arises from the short-range electronic coupling of wave functions, and thus the formation of minibands is expected. Quantum dot superlattices have the potential to be key materials for new optoelectronic devices, such as highly efficient solar cells and photodetectors. Herein, we report the fabrication of CdTe quantum dot superlattices via the layer-by-layer assembly of positively charged polyelectrolytes and negatively charged CdTe quantum dots. We can thus control the dimension of the quantum resonance by independently changing the distances between quantum dots in the stacking (out-of-plane) and in-plane directions. Furthermore, we experimentally verify the miniband formation by measuring the excitation energy dependence of the photoluminescence spectra and detection energy dependence of the photoluminescence excitation spectra. Designing quantum dot superlattices remains a challenge. Here, the authors present CdTe quantum dot superlattices via the layer-by-layer assembly and verify the miniband formation by measuring the excitation energy the dependence of the photoluminescence spectra and the detection energy dependence of the excitation spectra.
Collapse
Affiliation(s)
- TaeGi Lee
- Department of Applied Physics, Osaka City University, Osaka, 558-8585, Japan
| | - Kazushi Enomoto
- RIKEN Center for Emergent Matter Science (CEMS), Saitama, 351-0198, Japan
| | - Kazuma Ohshiro
- Department of Applied Physics, Osaka City University, Osaka, 558-8585, Japan
| | - Daishi Inoue
- RIKEN Center for Emergent Matter Science (CEMS), Saitama, 351-0198, Japan
| | - Tomoka Kikitsu
- RIKEN Center for Emergent Matter Science (CEMS), Saitama, 351-0198, Japan
| | - Kim Hyeon-Deuk
- Department of Chemistry, Kyoto University, Kyoto, 606-8502, Japan
| | - Yong-Jin Pu
- RIKEN Center for Emergent Matter Science (CEMS), Saitama, 351-0198, Japan.
| | - DaeGwi Kim
- Department of Applied Physics, Osaka City University, Osaka, 558-8585, Japan.
| |
Collapse
|
|
3
|
Nishimura H, Lin Y, Hizume M, Taniguchi T, Shigekawa N, Takagi T, Sobue S, Kawai S, Okuno E, Kim D. Synthesis of Mn-Doped ZnSe-ZnS Alloy Quantum Dots by a Hydrothermal Method. CHEM LETT 2019. [DOI: 10.1246/cl.190365] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hisaaki Nishimura
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Yuxin Lin
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Masayuki Hizume
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Taichi Taniguchi
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Naoteru Shigekawa
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tomomi Takagi
- Advanced Research and Innovation Center, DENSO CORPORATION, 500-1 Minamiyama, Komenoki-cho, Nisshin, Aichi 470-0111, Japan
| | - Susumu Sobue
- Advanced Research and Innovation Center, DENSO CORPORATION, 500-1 Minamiyama, Komenoki-cho, Nisshin, Aichi 470-0111, Japan
| | - Shoichi Kawai
- Advanced Research and Innovation Center, DENSO CORPORATION, 500-1 Minamiyama, Komenoki-cho, Nisshin, Aichi 470-0111, Japan
| | - Eiichi Okuno
- Advanced Research and Innovation Center, DENSO CORPORATION, 500-1 Minamiyama, Komenoki-cho, Nisshin, Aichi 470-0111, Japan
| | - DaeGwi Kim
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| |
Collapse
|
|
4
|
Iida K, Uehigashi Y, Ichida H, Bu HB, Kim D. Synthesis of Water-Soluble CuInS2 Quantum Dots by a Hydrothermal Method and Their Optical Properties. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20180399] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kazutaka Iida
- Department of Applied Physics, Osaka City University, Osaka 558-8585, Japan
| | - Yota Uehigashi
- Department of Applied Physics, Osaka City University, Osaka 558-8585, Japan
| | - Hideki Ichida
- Faculty of Engineering, Nippon Bunri University, Oita 870-0397, Japan
| | - Hang-Beom Bu
- Department of Applied Physics, Osaka City University, Osaka 558-8585, Japan
- Nano Earth, 1-5-20 Kashitanishi, Higashiosaka, Osaka 577-0835, Japan
| | - DaeGwi Kim
- Department of Applied Physics, Osaka City University, Osaka 558-8585, Japan
| |
Collapse
|
|
5
|
Bu HB, Kim D. Quick Synthesis of Water-soluble, Luminescent ZnTe Nanoparticles by Hydrothermal Technique. CHEM LETT 2018. [DOI: 10.1246/cl.170917] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hang-Beom Bu
- Nano Earth, 1-5-20 Kashitanishi, Higashiosaka, Osaka 577-0835, Japan
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - DaeGwi Kim
- Department of Applied Physics, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| |
Collapse
|
|
6
|
Watanabe T, Takahashi K, Shimura K, Bu HB, Hyeon-Deuk K, Kim D. Synthesis of Type-I CdTe Core and Type-II CdTe/CdS Core/Shell Quantum Dots by a Hydrothermal Method and Their Optical Properties. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20160299] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|